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2001 Fiscal Year Final Research Report Summary

Study on Electric Properties of Particle/Fluid Suspension

Research Project

Project/Area Number 09450282
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field 化学工学一般
Research InstitutionTohoku University

Principal Investigator

KONNO Mikio  Tohoku University, Graduate School of Engineering, Professor, 大学院・工学研究科, 教授 (40125547)

Project Period (FY) 1997 – 2000
Keywordselectrorheology / particle / aggregate structure / dielectrics / dielectric permittivity / electroconductivity / suspension
Research Abstract

Materials of particles suspended in fluid are expected to change fluid properties and structures with an application of external electric and magnetic fields. Several properties of such fluid materials have been investigated experimentally and theoretically Electrorheological (ER) effects are typically observed in particle/insulating oil dispersions, whose shear stress can drastically increase with the external electric field applied. In the past, a number of mechanisms were proposed to explain such behavior. On the basis of the consideration of particle aggregation structures under the electric field, poor understanding of the mechanism makes it difficult to establish the grounding of material design of ER fluids. This project employed an ER fluid of silica particles or ferroelectric barium titanate particles suspended in electrically insulating silicone oil. In-situ measurements of dielectricity, electroconductivity and generated shear stress were performed under an application of alternative electric field. The generated shear stress was found to closely depend on the dielectric constant of the suspension. This finding has led to the derivation of a new correlation equation for the generated shear stress, the generated permittivity and the external electric field strength. It is verified that the equation can be applied for a wide variety of experimental conditions.

  • Research Products

    (6 results)

All Other

All Publications (6 results)

  • [Publications] Yoshihisa Saimoto, Tomoaki Satoh, Mikio Konno: "Correlation between Generated Shear Stress and Generated Permittivity for the Electrorheological Response of Colloidal Silica Suspensionswth"Journal of Colloid and Interface Science. 219. 135-143 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Tooaki Satoh, Tetsuo Ashitaka, Yoshihisa Saimoto, Mikio Konno: "Electrorheological Response and Structure Growth of Colloidal Silica Suspensions"Journal of Colloid and Interface Science. 234. 19-23 (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 高野元峰, 今野幹男: "強誘電性チタン酸バリウム粒子分散系のエレクトロレオロジー効果と誘電特性の関係"日本レオロジー学会誌. 29. 15-19 (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Yoshihisa Saimoto, Tomoaki Satoh, Mikio Konno: "Correlation between Generated Shear Stress and Generated Permittivity for the Electrorheological Response of Colloidal Silica Suspensions"Journal of Colloid and Interface Seience. 219. 135-143 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Tomoaki Satoh, Tetsuo Ashitaka, Yoshihisa Saimoto, Mikio Konno: "Electrorheological Response and Structure Growth of Colloidal Silica Suspensions"Journal of Colloid and Interface Seience. 234. 19-23 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Genho Takano, Mikio Konno: "In-situ Measurements of Electrorheological Response and Electric Properties of Ferroelectric Barium Titanate / Silicone Oil Suspension"Nihon Reoroji Gakkaishi. 29. 15-19 (2001)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 2003-09-17  

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